21700293 has 8 divisors (see below), whose sum is σ = 30191808. Its totient is φ = 13837824.

The previous prime is 21700291. The next prime is 21700297. The reversal of 21700293 is 39200712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21700293 - 2¹ = 21700291 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21700291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157180 + ... + 157317.

It is an arithmetic number, because the mean of its divisors is an integer number (3773976).

Almost surely, 2^21700293 is an apocalyptic number.

21700293 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21700293 is a deficient number, since it is larger than the sum of its proper divisors (8491515).

21700293 is a wasteful number, since it uses less digits than its factorization.

21700293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314523.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 21700293 is about 4658.3573285011. The cubic root of 21700293 is about 278.9257005941.

The spelling of 21700293 in words is "twenty-one million, seven hundred thousand, two hundred ninety-three".